Efficient Delivery of Multi-Camera Interactive Content

ABSTRACT

Techniques are disclosed relating to encoding recorded content for distribution to other computing devices. In various embodiments, a first computing device records content of a physical environment in which the first computing device is located, the content being deliverable to a second computing device configured to present a corresponding environment based on the recorded content and content recorded by one or more additional computing devices. The first computing device determines a location of the first computing device within the physical environment and encodes the location in a manifest usable to stream the content recorded by the first computing device to the second computing device. The encoded location is usable by the second computing device to determine whether to stream the content recorded by the first computing device.

The present application claims priority to U.S. Prov. Appl. No.63/083,093, filed Sep. 24, 2020, which is incorporated by referenceherein in its entirety.

BACKGROUND Technical Field

This disclosure relates generally to computing systems, and, morespecifically, to encoding recorded content for distribution to othercomputing devices.

Description of the Related Art

Various streaming services have become popular as they provide a userthe opportunity to stream content to a variety of devices and in avariety of conditions. To support this ability, various streamingprotocols, such as MPEG-DASH and HLS, have been developed to account forthese differing circumstances. These protocols work by breaking upcontent into multiple segments and encoding the segments in differentformats that vary in levels of quality. When a user wants to streamcontent to a mobile device with a small screen and an unreliable networkconnection, the device might initially download video segments encodedin a format having a lower resolution. If the network connectionimproves, the mobile device may then switch to downloading videosegments encoded in another format having a higher resolution and/orhigher bitrate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating one embodiment of a system forefficiently delivering multi-camera interactive content.

FIG. 2 is a block diagram illustrating one embodiment of a presentingdevice selecting multi-camera content for delivery using the system.

FIG. 3 is a block diagram illustrating one embodiment of components usedby a camera of the system.

FIG. 4 is a block diagram illustrating one embodiment of components usedby a presenting device of the system.

FIGS. 5A-5C are flow diagrams illustrating embodiments of methods forefficiently delivering multi-camera interactive content.

FIG. 6 is a block diagram illustrating one embodiment of additionalexemplary components included in the presenting device, the recordingdevice, and/or a storage of system.

This disclosure includes references to “one embodiment” or “anembodiment.” The appearances of the phrases “in one embodiment” or “inan embodiment” do not necessarily refer to the same embodiment.Particular features, structures, or characteristics may be combined inany suitable manner consistent with this disclosure.

Within this disclosure, different entities (which may variously bereferred to as “units,” “circuits,” other components, etc.) may bedescribed or claimed as “configured” to perform one or more tasks oroperations. This formulation—[entity] configured to [perform one or moretasks]—is used herein to refer to structure (i.e., something physical,such as an electronic circuit). More specifically, this formulation isused to indicate that this structure is arranged to perform the one ormore tasks during operation. A structure can be said to be “configuredto” perform some task even if the structure is not currently beingoperated. A “display system configured to display three-dimensionalcontent to a user” is intended to cover, for example, a liquid crystaldisplay (LCD) performing this function during operation, even if the LCDin question is not currently being used (e.g., a power supply is notconnected to it). Thus, an entity described or recited as “configuredto” perform some task refers to something physical, such as a device,circuit, memory storing program instructions executable to implement thetask, etc. This phrase is not used herein to refer to somethingintangible. Thus, the “configured to” construct is not used herein torefer to a software entity such as an application programming interface(API).

The term “configured to” is not intended to mean “configurable to.” Anunprogrammed FPGA, for example, would not be considered to be“configured to” perform some specific function, although it may be“configurable to” perform that function and may be “configured to”perform the function after programming.

Reciting in the appended claims that a structure is “configured to”perform one or more tasks is expressly intended not to invoke 35 U.S.C.§ 112(f) for that claim element. Accordingly, none of the claims in thisapplication as filed are intended to be interpreted as havingmeans-plus-function elements. Should Applicant wish to invoke Section112(f) during prosecution, it will recite claim elements using the“means for” [performing a function] construct.

As used herein, the terms “first,” “second,” etc. are used as labels fornouns that they precede, and do not imply any type of ordering (e.g.,spatial, temporal, logical, etc.) unless specifically stated. Forexample, in a processor having eight processing cores, the terms “first”and “second” processing cores can be used to refer to any two of theeight processing cores. In other words, the “first” and “second”processing cores are not limited to processing cores 0 and 1, forexample.

As used herein, the term “based on” is used to describe one or morefactors that affect a determination. This term does not foreclose thepossibility that additional factors may affect a determination. That is,a determination may be solely based on specified factors or based on thespecified factors as well as other, unspecified factors. Consider thephrase “determine A based on B.” This phrase specifies that B is afactor used to determine A or that affects the determination of A. Thisphrase does not foreclose that the determination of A may also be basedon some other factor, such as C. This phrase is also intended to coveran embodiment in which A is determined based solely on B. As usedherein, the phrase “based on” is thus synonymous with the phrase “basedat least in part on.”

A physical environment refers to a physical world that people can senseand/or interact with without aid of electronic systems. The physicalenvironment may include physical features such as a physical surface ora physical object. For example, the physical environments may correspondto a physical park that includes physical trees, physical buildings, andphysical people. People can directly sense and/or interact with thephysical environment, such as through sight, touch, hearing, taste, andsmell.

In contrast, an extended reality (XR) environment (or acomputer-generated reality (CGR) environment) refers to a wholly orpartially simulated environment that people sense and/or interact withvia an electronic system. For example, the XR environment may includeaugmented reality (AR) content, mixed reality (MR) content, virtualreality (VR) content, and/or the like. With an XR system, a subset of aperson's physical motions, or representations thereof, are tracked, and,in response, one or more characteristics of one or more virtual objectssimulated in the XR environment are adjusted in a manner that comportswith at least one law of physics. As one example, the XR system maydetect a person's head movement and, in response, adjust graphicalcontent and an acoustic field presented to the person in a mannersimilar to how such views and sounds would change in a physicalenvironment. As another example, the XR system may detect movement ofthe electronic device presenting the XR environment (e.g., a mobilephone, a tablet, a laptop, or the like) and, in response, adjustgraphical content and an acoustic field presented to the person in amanner similar to how such views and sounds would change in a physicalenvironment. In some situations (e.g., for accessibility reasons), theXR system may adjust characteristic(s) of graphical content in the XRenvironment in response to representations of physical motions (e.g.,vocal commands).

A person may sense and/or interact with an XR object using a gesture orany one of their senses, including sight, sound, and touch. For example,a person may sense and/or interact with audio objects that create 3D orspatial audio environment that provides the perception of point audiosources in 3D space. In another example, audio objects may enable audiotransparency, which selectively incorporates ambient sounds from thephysical environment with or without computer-generated audio. In someXR environments, a person may sense and/or interact only with audioobjects.

Examples of XR include virtual reality and mixed reality.

A virtual reality (VR) environment refers to a simulated environmentthat is designed to be based entirely on computer-generated sensoryinputs for one or more senses. A VR environment comprises a plurality ofvirtual objects with which a person may sense and/or interact. Forexample, computer-generated imagery of trees, buildings, and avatarsrepresenting people are examples of virtual objects. A person may senseand/or interact with virtual objects in the VR environment through asimulation of the person's presence within the computer-generatedenvironment, and/or through a simulation of a subset of the person'sphysical movements within the computer-generated environment.

A mixed reality (MR) environment refers to a simulated environment thatis designed to incorporate sensory inputs from the physical environment,or a representation thereof, in addition to including computer-generatedsensory inputs (e.g., virtual objects). On a virtuality continuum, amixed reality environment is anywhere between, but not including, awholly physical environment at one end and virtual reality environmentat the other end.

In some MR environments, computer-generated sensory inputs may respondto changes in sensory inputs from the physical environment. Also, someelectronic systems for presenting an MR environment may track locationand/or orientation with respect to the physical environment to enablevirtual objects to interact with real objects (that is, physicalarticles from the physical environment or representations thereof). Forexample, a system may account for movements so that a virtual treeappears stationery with respect to the physical ground.

Examples of mixed realities include augmented reality and augmentedvirtuality.

An augmented reality (AR) environment refers to a simulated environmentin which one or more virtual objects are superimposed over a physicalenvironment, or a representation thereof. For example, an electronicsystem for presenting an AR environment may have a transparent ortranslucent display through which a person may directly view thephysical environment. The system may be configured to present virtualobjects on the transparent or translucent display, so that a person,using the system, perceives the virtual objects superimposed over thephysical environment. Alternatively, a system may have an opaque displayand one or more imaging sensors that capture images or video of thephysical environment, which are representations of the physicalenvironment. The system composites the images or video with virtualobjects, and presents the composition on the opaque display. A person,using the system, indirectly views the physical environment by way ofthe images or video of the physical environment, and perceives thevirtual objects superimposed over the physical environment. As usedherein, a video of the physical environment shown on an opaque displayis called “pass-through video,” meaning a system uses one or more imagesensor(s) to capture images of the physical environment, and uses thoseimages in presenting the AR environment on the opaque display. Furtheralternatively, a system may have a projection system that projectsvirtual objects into the physical environment, for example, as ahologram or on a physical surface, so that a person, using the system,perceives the virtual objects superimposed over the physicalenvironment.

An augmented reality environment also refers to a simulated environmentin which a representation of a physical environment is transformed bycomputer-generated sensory information. For example, in providingpass-through video, a system may transform one or more sensor images toimpose a select perspective (e.g., viewpoint) different than theperspective captured by the imaging sensors. As another example, arepresentation of a physical environment may be transformed bygraphically modifying (e.g., enlarging) portions thereof, such that themodified portion may be representative but not photorealistic versionsof the originally captured images. As a further example, arepresentation of a physical environment may be transformed bygraphically eliminating or obfuscating portions thereof.

An augmented virtuality (AV) environment refers to a simulatedenvironment in which a virtual or computer-generated environmentincorporates one or more sensory inputs from the physical environment.The sensory inputs may be representations of one or more characteristicsof the physical environment. For example, an AV park may have virtualtrees and virtual buildings, but people with faces photorealisticallyreproduced from images taken of physical people. As another example, avirtual object may adopt a shape or color of a physical article imagedby one or more imaging sensors. As a further example, a virtual objectmay adopt shadows consistent with the position of the sun in thephysical environment.

There are many different types of electronic systems that enable aperson to sense and/or interact with various XR environments. Examplesinclude head mountable systems, projection-based systems, heads-updisplays (HUDs), vehicle windshields having integrated displaycapability, windows having integrated display capability, displaysformed as lenses designed to be placed on a person's eyes (e.g., similarto contact lenses), headphones/earphones, speaker arrays, input systems(e.g., wearable or handheld controllers with or without hapticfeedback), smartphones, tablets, and desktop/laptop computers. A headmountable system may have one or more speaker(s) and an integratedopaque display. Alternatively, a head mountable system may be configuredto accept an external opaque display (e.g., a smartphone). The headmountable system may incorporate one or more imaging sensors to captureimages or video of the physical environment, and/or one or moremicrophones to capture audio of the physical environment. Rather than anopaque display, a head mountable system may have a transparent ortranslucent display. The transparent or translucent display may have amedium through which light representative of images is directed to aperson's eyes. The display may utilize digital light projection, OLEDs,LEDs, uLEDs, liquid crystal on silicon, laser scanning light source, orany combination of these technologies. The medium may be an opticalwaveguide, a hologram medium, an optical combiner, an optical reflector,or any combination thereof. In some implementations, the transparent ortranslucent display may be configured to become opaque selectively.Projection-based systems may employ retinal projection technology thatprojects graphical images onto a person's retina. Projection systemsalso may be configured to project virtual objects into the physicalenvironment, for example, as a hologram or on a physical surface.

DETAILED DESCRIPTION

In some instances, an extended reality (XR) environment (or other formof computer generated environment) may be generated based on a physicalenvironment using content recorded by multiple cameras present in thephysical environment. For example, in some embodiments discussed below,an XR environment may be generated using content created by multipledevices recording a concert at a concert venue. A user, who may not beattending the concert in person, may still be able to have an immersiveXR experience of the concert through being able to look and move aroundwithin the XR environment to view the concert from different positionswithin the XR environment. Due to network and processing constraints,downloading every recording of a physical environment, however, mayquickly become impractical as the number of recording devices increasesand/or the quality of content increases.

The present disclosure describes embodiments of a system for moreefficiently delivering multi-camera interactive content. As will bedescribed in greater detail below, in various embodiments, a recordingdevice capturing content within a physical environment can determine itslocation within the physical environment and encode its location in amanifest usable to stream the recorded content. A device presenting anXR environment based on the recorded content and content recorded by oneor more additional devices can then use the encoded location todetermine whether to stream the content recorded based on a locationwhere a user of the presenting device is attempting to view contentwithin the XR environment. Continuing with the concert venue example, ifa user is attempting to view content at a location near the concertstage in an XR environment, the presenting device may attempt todownload content recorded near the concert stage as such content islikely relevant to the user's current field of view. In contrast,content recorded at the back of the concert venue may not be relevant tothe user's current field of view, so the presenting device maydetermine, based on the encoded location of this content, to notdownload this content. In some embodiments, the recording device mayalso determine its pose while recording content and encode the pose inthe manifest so that the presenting device can determine an orientationof the recording device within the physical environment in order todetermine whether it is relevant to a user's field of view. For example,even though a user viewing content within the XR environment may selecta viewport location corresponding to a location near where content wasrecorded, the record content may be less relevant to the user's field ofview if the viewing user has a pose in the opposite direction of thepose of the recording device such as a user looking toward the audiencein a concert when the recording device had a pose directed toward thestage.

Being able to intelligently determine what recorded content is relevantbased on the encoded locations and poses of recording devices within thephysical environment may allow a device presenting a corresponding XRenvironment to greatly reduce the amount of content being streamed asirrelevant content can be disregarded—thus saving valuable networkbandwidth. Still further, encoding location and pose information in amanifest provides an efficient way for a presenting device to quicklydiscern what content is relevant—thus saving valuable processing andpower resources.

Turning now to FIG. 1, a block diagram of a content delivery system 10is depicted. In the illustrated embodiment, system 10 includes multiplecameras 110A-C, a storage 120, and a presenting device 130. As shown,cameras 110 may include encoders 112. Storage 120 may include manifests122A-C and segments 124A-C. Presenting device 130 may include astreaming application 132. In some embodiments, system 10 may beimplemented differently than shown. For example, more (or less)recording devices 110 and presenting devices 130 may be used, encoder112 could be located at storage 120, a single (or fewer) manifests 122may be used, different groupings of segments 124 may be used, etc.

Cameras 110 may correspond to (or be included within) any suitabledevice configured to record content of a physical environment. In someembodiments, cameras 110 may correspond to point-and-shoot cameras,single-lens reflex camera (SLRs), video cameras, etc. In someembodiments, cameras 110 may correspond to (or be included within) otherforms of recording devices such as a phone, tablet, laptop, desktopcomputer, etc. In some embodiments, cameras 110 may correspond to (or beincluded within) a head mounted display, such as, a headset, helmet,goggles, glasses, a phone inserted into an enclosure, etc. and mayinclude one or more forward facing cameras 110 to capture content infront of a user's face. As yet another example, cameras 110 may beincluded in a vehicle dash recording system. Although various exampleswill be described herein in which recorded content includes video oraudio content, content recorded by camera 110 may also include sensordata collected from one or more sensors in camera 110 such as worldsensors 604 and/or user sensors 606 discussed below with respect to FIG.6.

As also shown in FIG. 1 and discussed in greater detail below, cameras110 may record content of a physical environment from differentlocations within a space 100. For example, in some embodiments, thephysical environment may be sports venue (e.g., a stadium) where cameras110 are placed at different locations to capture a sporting event fromdifferent angles and stream content in real time. As another example, insome embodiments, the physical environment may be a movie set wheremultiple cameras 110 are affixed to a mobile rig to capture a scene fromdifferent perspectives. While the locations of cameras 110, in someinstances, may be static, the locations of cameras 110, in otherinstances, may be dynamic—and cameras 110 may begin recording content atdifferent times relative to one another. Continuing with the concertexample discussed above, cameras 110 may be held by various attendees ofthe concert that move around within the venue while recording content.As attendees enter or leave the venue, attendees may begin recordingcontent at different times and for different lengths of time over thecourse of the concert. As yet another example, two people may beinviting a friend to share a co-presence experience with them and may bewearing head mounted displays including (or corresponding to) cameras110. Other examples of potential physical environments may includeparks, museums, shopping venues, etc. To facilitate the distribution ofcontent recorded in a physical environment to a device presenting acorresponding XR environment, cameras 110 may each use a respectiveencoder 112.

Encoder 112, in various embodiments, is operable to encode recordedcontent in manner that facilities streaming of the content to anotherdevice such as presenting device 130 discussed below. As will bediscussed in greater detail below with FIG. 3, encoder 112 may includeone or more video and/or audio codecs usable to produce encoded content118 in a variety of formats and levels of quality. To facilitategenerating a corresponding XR environment, an encoder 112 (or moregenerally camera 110) may also determine one or more locations 114 andposes 116 of a camera 110 and encode this information in content 118 inorder to facilitate a streaming device's selection of that content.Location 114, in the various embodiment, is a position of a camera 110within a physical environment while the camera 110 records content. Forexample, in the illustrated embodiment, location 114 may be specifiedusing Cartesian coordinates X, Y, and Z as defined within space 100;however, location 114 may be specified in encoded content 118 using anysuitable coordinate system. In order to determine one camera 110'slocation 114 relative to the location 114 of another camera 110,locations 114 may be expressed relative to a common reference space 100(or relative to a common point of reference) used by cameras 110—as wellas presenting device 130 as will be discussed below. Continuing with theconcert example, space 100, in some embodiments, may be defined in termsof the physical walls of the concert venue, and location 114 may beexpressed in terms of distances relative to those walls. Pose 116, invarious embodiments, is a pose/orientation of a camera 110 within aphysical environment while the camera 110 records content. For example,in some embodiments, a pose 116 may be specified using a polar angle θ,azimuthal angle φ, and rotational angle r; however, in otherembodiments, a pose 116 may be expressed differently. As a given camera110 may change its location 114 or pose 116 over time, a camera 110 mayencode multiple locations 114 and/or poses 116—as well as multiplereference times to indicate where the camera 110 was located and itscurrent pose at a given point of time. These reference times may also bebased on a common time reference shared among cameras 110 in order toenable determining a recording time of one encoded content 118 vis-à-visa recording time of another as cameras 110 may not start recordingcontent at the same time. As shown in FIG. 1, these locations 114 andposes 116 may be specified within manifests 122, which may be providedby cameras 110 along with segments 124 to storage 120.

Storage 120, in various embodiments, is configured to store encodedcontent 118A-C received from cameras 110A-110C and facilitate streamingthe encoded content 118. In some embodiments, storage 120 may be asingle computing device, a network attached storage, etc. In otherembodiments, storage 120 may be provided by a computer clusterimplementing a cloud-based storage. As noted above, storage 120 maystore encoded content 118 in the form of a manifest 122 andcorresponding segments 124. In various embodiments, manifests 122include metadata about each segment 124 so that a recipient can selectthe appropriate segments 124. For example, a manifest 122 may include auniform resource identifier (URI) indicating where the 720p segments 124can be downloaded for a particular encoded content 118. In variousembodiments, storage 120 may support the streaming of encoded content118 via the HyperText Transfer Protocol (HTTP) and using a streamingprotocol such as HTTP Live Streaming (HLS), Moving Picture Experts GroupDynamic Adaptive Streaming over HTTP (MPEG-DASH), etc. In an embodimentin which HLS is used, manifests 122 may be implemented using one or more.m3u8 files. In an embodiment in which MPEG-DASH is used, manifests 122may be implemented as Media Presentation Descriptions (MPDs). In otherembodiments, other transmission protocols may be used, which may (or maynot) leverage HTTP—and, generation of the XR environment may occur wellafter content 132 has been downloaded from storage 120 in someembodiments. Encoded segments 124 are small portions of recorded content118 that are encoded in multiple formats. For example, recorded content118 may be broken up into ten-second portions. Each portion is thenencoded in multiple formats such as a first group of segments 124encoded in 480p, a second group of segments 124 encoded in 720p., and soforth. Although, in the illustrated embodiment, each camera 110A-C isshown as creating a respective manifest 122A-C, cameras 110, in otherembodiments, may record metadata including locations 114 and poses 116to a shared manifest 122.\

Presenting device 130, in various embodiments, is configured to present,to the user, an environment corresponding to the physical environmentbased encoded content 118 created by cameras 110. In some embodiments,presenting device 130 is a head mounted display, such as, a headset,helmet, goggles, glasses, a phone inserted into an enclosure, etc.;however, in other embodiments, presenting device 130 may correspond toother suitable devices such as a phone, camera, tablet, laptop, ordesktop computer. In some embodiments, this corresponding environment isan XR environment. In other embodiments, other forms of environments maybe presented. To facilitate presentation of this correspondingenvironment, in the illustrated embodiment, presenting device 130executes a streaming application 132 that may receive a request from auser to stream a particular type of content 118 (e.g., a soccer game)and selectively download encoded content 134 from storage 120. As willbe described next with FIG. 2, streaming application 132 may downloadmanifests 122A-C in order to identify locations 114 and/or poses 116 ofcameras 110 while recording segments 124 of the physical environment.Streaming application 132 may then determine what segments 124 todownload from storage 120 based on a location where a user views contentwithin the XR environment and based on a pose of the presenting device130 (or of the user) while presenting the XR environment. In variousembodiments, selected segments 124 includes segments 124 determined toinclude content 118 within a user's field of view as well as segments124 determined to include content 118 that may be partially within auser's field of view in order to be patched into contiguous scene withinthe user's field of view. As a user may alter his or her location orpose while interacting with the XR environment, streaming application132 may alter what segments 124 are downloaded based on the user'schanging field of view. In some embodiments, segments 124 may also bedownloaded if they are identified as having content 118 located near auser's field of view in anticipation that they may become relevant if auser's location or pose changes. Streaming application 132 may alsoconsider other factors in request different encoded content 134 such aspresenting devices 130's networking and compute resources, which maychange over time.

Turning now to FIG. 2, a block diagram of a selection 200 of encodedcontent 134 is depicted. In the illustrated example, streamingapplication 132 is performing a selection 200 from three groups ofencoded content 118 created by cameras 110. In particular, segments 124Aproduced by camera 110A may depict content in a first frame 212A,segments 124B produced by camera 110B may depict content in a secondframe 212B, and segments 124C produced by camera 110C may depict contentin a third frame 212C. As shown, this selection 200 may begin withstreaming application 132 downloading manifests 122 and determining alocation 202 and a pose 204.

Location 202, in various embodiments, is a location where a user ofpresenting device views content within the XR environment. As will bedescribed below with respect to FIG. 4, location 202 may initiallycorrespond to some default location within the XR environment. A usermay then alter this location 202 using one or more user input devices(e.g., a joystick) to move around within the XR environment. Forexample, a user may start at an initial location in a sports venue butthen decide to move over to a portion of field where interesting actionis occurring. In the illustrated embodiment, locations 202 may bespecified using Cartesian coordinates X, Y, and Z as defined withinspace 100; however, in other embodiments, location 202 may be specifiedusing other suitable coordinate systems.

Pose 204, in various embodiments, is a pose of the user (and presentingdevice 130 in some embodiments) while a user views content within the XRenvironment. In the illustrated embodiment in which presenting device130 is an HMD, pose 204 may corresponds to an orientation of the user'shead. A user may then alter his or her pose 204 by looking to the leftor right, for example. As will be described with FIG. 4, a user may alsoalter pose 204 using one or more input devices of presenting device 130.In some embodiments, poses 204 may be specified using a polar angle θ,azimuthal angle φ, and rotational angle r; however, in otherembodiments, poses 204 may be expressed differently.

Based on location 202 and pose 204, streaming application 132 may readmanifests 122 to identify the locations 114 and poses 116 of segments124 in order to determine which segments 124 are relevant to a user'scurrent field of view. In the depicted example, streaming application132 may determine that frames 212A-C are all relevant to the user'scurrent field of view. Based on the depicted location 202 and pose 204,however, streaming application 132 may determine that frame 212C islocated behind by frame 212A or frame 212B and thus determine todownload segments 124A and 124B but not segments 124C. Continuing withthe concert example discussed above, frames 212A-C may be captured bycameras 110 held by three separate concertgoers looking toward a stagewhere the camera producing frame 212A is held by the concertgoerfurthest from the stage and the camera producing frame 212C is held bythe concertgoer closest to the stage. As location 202 in the exampledepicted in FIG. 2 closest to frame 212A and (even further from thestage), streaming application 132 may initially download segments 124Aincluding frame 212A and forgo downloading segments 124C including frame212C. As a user's current location 202 and/or pose 204 changes,streaming application 132 may determine to discontinue streaming thecontent recorded by one camera 110 and determine to stream the contentrecorded by another camera 110. For example, if the user moved forwardalong the path of pose 204 toward the concert stage, at some point,frames 212A and 212B would be located behind the user's current field ofview, but frame 212C might still be directly in front of the view. Thus,streaming application 132 may begin downloading segments 124Ccorresponding to frame 212C but discontinue downloading segments 124Aand 124B corresponding to frames 212A and 212B respectively. Similarly,streaming application 132 may discontinue downloading segments 124A-C ifa user remained at the same location 202 but altered pose 204 such thatframe 212A-C are no longer in the user's current field of view.

In some embodiments, streaming application 132 may further patchtogether content of multiple frames 212 in order to present a continuousview to the user. As shown, streaming application 132 may determine,from manifests 122, that frame 212B may be partially overlapped by frame212A based on the user's current field of view. In the event that frame212A does not fully occupy the user's current field of view, streamingapplication 132 may decide to still use frame 212A as a main frame andthen use frame 212B (assuming it is able to supply some of the missingcontent) as a patch frame such that patch portion 214A is combined withmain frame 212A to produce a continuous view. The overlapping portion214B of frame 212B, however, may be discarded. In instances in whichframes 212A and 212B are not being streamed in real-time, streaming 132may read the references times included in manifests 122 in order to thatframes 212A and 212B were created during an overlapping time frame andthus can be patched together. If patch frame 212B were created at sometime after main frame 212A, it may not be possible to patch frames 212together in order to create a contiguous view.

Some of the recording-device components used within camera 110 tofacilitate encoding content 118 will now be discussed.

Turning now to FIG. 3, a block diagram of components in camera 110 isdepicted. In the illustrated embodiment, camera 110 includes one or morelocation sensors 310, one or more pose sensors 320, clock 330, one ormore image sensors 340, one or more microphones 350, and encoder 112. Inother embodiments, camera 110 may be implemented differently than shown.For example, camera 110 may include other sensors that produceinformation used to encode content 118.

Location sensors 310, in various embodiments, are sensors configured todetermine a location 114 of camera 110 while it records content 118. Insome embodiments, sensors 310 include light-based location sensors thatcapture depth (or range) information by emitting a light and detectingits reflection on various for objects and surfaces in the physicalenvironment. Such a sensor may, for example, employ infrared (IR)sensors with an IR illumination source, Light Detection and Ranging(LIDAR) emitters and receivers, etc. This range information may, forexample, be used in conjunction with frames captured by cameras todetect and recognize objects and surfaces in the physical environment inorder to determine a location 114 of camera 110 relative to locationsand distances of objects and surfaces in the physical environment. Insome embodiments, location sensors 310 include wireless sensors thatdetermine a location 114 based on the signal strength of a signalemitted by a location beacon acting as a known point of reference withinthe physical environment such as a location beacon using Bluetooth® lowenergy (LE). In some embodiments, location sensors 310 includegeolocation sensors such as ones supporting Global Positioning System(GPS), global navigation satellite system (GNSS), etc. In otherembodiments, other forms of location sensors may be employed.

Pose sensors 320, in various embodiments, are sensors configured todetermine a pose 116 of camera 110 while it records content 118.Accordingly, pose sensors 320 include one or more inertial measurementunit (IMU) sensors, accelerometer sensors, gyroscope sensors,magnetometer sensors, etc. configured to determine a pose of camera 110while recording the content 118. In some embodiments, pose sensors 320may employ one or more visual inertial odometry algorithms using cameraand IMU-sensor inputs. In some embodiments in which camera 110 is alsoan HMD, pose sensors 320 may include may capture information about theposition and/or motion of the user and/or the user's head whilerecording content 118. In some embodiments, pose sensors 320 includewireless sensors that determine a pose 116 using a directional antennaused to assess the signal strength of a signal emitted by a locationbeacon.

Clock 330, in various embodiments, is configured to maintain a currenttime that can be used as a reference time to determine when content 118is recorded by camera 110. As mentioned above, this reference time maybe encoded in manifest 122 and may be usable by streaming application132 to determine whether particular segments 124 relative to a time atwhich a user is viewing content 134. Streaming application 132 may alsouse this reference time along with the reference times associated withthe content 118 recorded by the one or more other cameras 110 to patchtogether the content recorded by the cameras 110 to present the XRenvironment. In order to maintain the accuracy of clock 330, camera 110may periodically synchronize clock 330 with a trusted authority, forexample, using the network time protocol.

Image sensors 340, in various embodiments, are configured to recordimages 342 for inclusion in segments 124. Accordingly, images sensors340 may include one or more metal-oxide-semiconductor (CMOS) sensors,N-type metal-oxide-semiconductor (N-MOS) sensors, or other suitablesensors. In some embodiments in which camera 110 is an HIVID, imagesensors 340 may include left and right sensors 340 located on a frontsurface of the HMD at positions that are substantially in front of eachof the user's eyes.

Microphones 350, in various embodiments, are configured to record audio352 for inclusion in segments 124. In some embodiments, microphones 350include a left-side microphone 350 and a right-side microphone 350 inorder to produce stereo audio 352. In some embodiments, microphones 350may include a microphone array of several microphones differentpositions in order to generate spatial audio. Microphones 350 maycorrespond to any suitable type and may be omni-directional,unidirectional, etc.

In the illustrated embodiment, encoder 112 receives location 114, pose116, reference time 332, images 342, and audio 352 in order to performthe encoding of recorded content 118 for camera 110. Encoder 112 maythus include various video codecs 360A and audio codecs 360B operable toproduce a manifest 122 and segments 124. For example, as shown, encoder112 may include a video codec 360A supporting H.264/AVC encoding at1080p (1920×1080 resolution) and at 30 fps. Encoder 112 may also includean audio codec 360B supporting AAC-HE v2 encoding at 160 kb/s. Video andaudio codecs 360 may, however, support any suitable formats. In someembodiments, codecs 360 may encode content other than video and audiocontent such as sensor data as noted above and discussed below. In someembodiments, codecs 360 may be implemented in software that is executedby camera 110 to generate manifests 122 and segments 124. In someembodiments, codecs 360 may be implemented in dedicated hardwareconfigured to generate segments manifests 122 and segments 124. Forexample, camera 110 may include image signal processor, a system on achip (SoC) having an image sensor pipeline, etc. with dedicated codec360 circuitry.

Turning now to FIG. 4, a block diagram of components in presentingdevice 130 is depicted. In the illustrated embodiment, presenting device130 includes one or more user inputs devices 410, pose sensors 420,streaming application 132 including content predictor 430, a display440, speakers 450. In some embodiments, presenting device 130 may beimplemented differently than shown such as including one or morecomponents discussed below with respect to FIG. 6.

User input devices 410, in various embodiments, are configured tocollect information from a user in order to determine a user's location202 within an XR environment. For example, when streaming begins, auser's viewing location 202 may initially be set to some defaultlocation 202. A user may then want to alter this location 202 andprovide corresponding inputs to user input devices 410 to cause thelocation 202 to be altered. For example, in an embodiment in which userinput devices 410 include a joystick, a user may push forward on thejoystick to move the viewing location 202 forward in the direction ofthe user's pose. User input devices 410, however, may include any ofvarious devices. In some embodiments, user input devices 410 may includea keyboard, mouse, touch screen display, motion sensor, steering wheel,camera, etc. In some embodiments, user input devices 410 include one ormore user sensors that may include one or more hand sensors (e.g., IRcameras with IR illumination) that track position, movement, andgestures of the user's hands, fingers, arms, legs, and/or head. Forexample, in some embodiments, detected position, movement, and gesturesof the user's hands, fingers, and/or arms may be used to alter a user'slocation 202. As another example, in some embodiments, the changing of auser's head position as determined by one or more sensors, such ascaused by a user leaning forward (or backward) and/or walking aroundwithin a room, may be used to alter a user's location 202 within an XRenvironment.

Pose sensors 420, in various embodiments, are configured to collectinformation from a user in order to determine a user's pose 204 withinan XR environment. In some embodiments, pose sensors 420 may beimplemented in a similar manner as pose sensors 320 discussed above.Accordingly, pose sensors 420 may include head pose sensors and eyetracking sensors that determine a user's pose 204 based on a currenthead position and eye positions. In some embodiments pose sensors 420may correspond to user input devices 410 discussed above. For example, auser may adjust his or her pose 204 by pushing forward or backward on ajoystick to move the pose 204 up or down.

As discussed above, streaming application 132 may consider a user'slocation 202 and pose 204 to select encoded content 134 for presentationon presenting device 130. In the illustrated embodiment, streamingapplication 132 may initiate its exchange with storage 120 to obtainselected content 134 by sending, to storage 120, a request 432 to streamcontent recorded by cameras 110 of a physical environment. In responseto the request 432, streaming application 132 may receive one or moremanifests 122 usable to stream content 134 recorded by cameras 110.Based on the locations 114 and poses 116 of cameras 110 identified inthe manifests, streaming application 132 may send, to storage 120,requests 434 to provide segments 124 of the recorded content 118selected based a location 202 where a user of views content within theXR environment as identified by user input devices 410 and a pose 204 asidentified by pose sensors 420. In some embodiments discussed below,streaming application 132 may further send requests 434 for segments 124based on a prediction by predictor 430 that the segments 124 may beneeded based on future locations 202 and poses 204. Streamingapplication 132 may then receive, from storage 120, the requestedsegments 124 and process these segments 124 to produce a correspondingXR view 436 presented via display 440 and corresponding XR audio 438presented via speakers 450.

Predictor 430, in various embodiments, is executable to predict whatcontent 118 may be consumed in the future so that streaming application132 can begin downloading the content in advance of it be consumed.Accordingly, predictor 430 may predict a future location 202 and/or pose204 where the user is likely to view content within the XR environmentand, based on the predicted location 202 and/or 204, determining to whatcontent 118 should likely be streamed by streaming application 132. Invarious embodiments, predictor 430 tracks previous history of locations202 and pose 204 information and attempt to infer future locations andposes 204 using a machine learning algorithm such as linear regression.In some embodiments, predictor 430's inference may be based onproperties of the underlying content being streamed. For example, if auser is viewing content and it is known that an item is going to appearin the content that is likely to draw the user's attention (e.g., anexplosion depicted on the user's peripheral), predictor 430 may assumethat the user is likely to alter his or her location 202 and/or pose 204to view the item. In other embodiments, other techniques may be employedto predict future content 118 to select from storage 120.

Turning now to FIG. 5A, a flow diagram of a method 500 is depicted.Method 500 is one embodiment of a method that may be performed by afirst computing device recording content, such as camera 110 usingencoder 112. In many instances, performance of method 500 may allowrecorded content to be delivered more efficiently.

In step 505, the first computing device records content of a physicalenvironment in which the first computing device is located. In variousembodiments, the content is deliverable to a second computing device(e.g., presenting device 130) configured to present a correspondingenvironment based on the recorded content and content recorded by one ormore additional computing devices (e.g., other cameras 110). In someembodiments, the first computing device is a head mounted display (HMD)configured to record the content using one or more forward facingcameras included in the HMD. In some embodiments, the correspondingenvironment is an extended reality (XR) environment.

In step 510, the first computing device determines a location (e.g.,location 114) of the first computing device within the physicalenvironment. In some embodiments, the first computing device alsodetermines a pose (e.g., pose 116) of the first computing device whilerecording the content and/or determines a reference time (e.g.,reference time 332) for when the content is recorded by the firstcomputing device.

In step 515, the first computing device encodes the location in amanifest (e.g., a manifest 122) usable to stream the content recorded bythe first computing device to the second computing device. In variousembodiments, the encoded location is usable by the second computingdevice to determine whether to stream the content recorded by the firstcomputing device. In some embodiments, the location is encoded in amanner that allows the second computing device to determine a locationwhere the content is recorded by the first computing device relative toa location (e.g., location 202) where a user of the second computingdevice views content within the corresponding environment. In someembodiments, the first computing device also encodes the pose in themanifest, the encoded pose being usable by the second computing deviceto determine whether to stream the content recorded by the firstcomputing device based on a pose (e.g., pose 204) of the secondcomputing device while presenting the corresponding environment. In someembodiments, the first computing device also encodes the reference timein the manifest, the reference time being usable by the second computingdevice with reference times associated with the content recorded by theone or more additional computing devices to patch together the contentrecorded by the first computing device and the content recorded by theone or more additional computing devices to present the correspondingenvironment.

In some embodiments, method 500 further includes providing, to a storage(e.g., storage 120) accessible to the second computing device forstreaming the recorded content, segments (e.g., segments 124) of therecorded content and the manifest. In some embodiments, the manifest isa media presentation description (MPD) usable to stream the recordedcontent to the second computing device via Moving Picture Experts GroupDynamic Adaptive Streaming over HTTP (MPEG-DASH). In some embodiments,the manifest is one or more .m3u8 files usable to stream the recordedcontent to the second computing device via HTTP Live Streaming (HLS).

Turning now to FIG. 5B, a flow diagram of a method 530 is depicted.Method 530 is one embodiment of a method that may be performed by acomputing device presenting encoded content, such as presenting device130 using streaming application 132. In many instances, performance ofmethod 530 may allow a user accessing presented content to have a betteruser experience.

In step 535, the computing device presents a corresponding environmentbased on content (e.g., content 118) recorded of a physical environmentby a plurality of recording devices within the physical environment. Insome embodiments, the corresponding environment is an extended reality(XR) environment.

In step 540, as part of presenting the corresponding environment, thecomputing device downloads a manifest (e.g., manifest 122) identifying alocation (e.g., location 114) of a first of the plurality of recordingdevices while recording content of the physical environment. In variousembodiments, the computing device also reads pose information includedin the downloaded manifest, the pose information identifying a pose(e.g., pose 116) of the first recording device while recording contentof the physical environment. In various embodiments, the computingdevice also reads a reference time (e.g. reference time 332) included inthe downloaded manifest, the reference time identifying when the contentis recorded by the first recording device.

In step 545, the computing device determines to stream the contentrecorded by the first recording device based on the identified locationand a location (e.g., location 202) where a user views content withinthe corresponding environment. In various embodiments, the computingdevice also determines to stream the content recorded by the firstrecording device based on the identified pose and a pose (e.g., pose204) of the computing device while a user views content within thecorresponding environment. In one embodiment, the computing device is ahead mounted display (HMD), and the pose of the computing devicecorresponds to an orientation of the user's head. In some embodiments,the computing device creates a view (e.g., XR view 436) of thecorresponding environment by patching together the content recorded bythe first recording device and content recorded by one or more others ofthe plurality of recording devices based on the reference time andreference times associated with the content recorded by the one or moreother recording devices.

In some embodiments, method 530 further includes receiving an input(e.g., via a user input device 410) from the user altering the locationwhere the user views content within the XR environment. In such anembodiment, in response to the altered location, the computing devicedetermines to discontinue streaming the content recorded by the firstrecording device and determines to stream the content recorded by asecond of the plurality of recording devices based on an identifiedlocation of the second recording device. In some embodiments, thecomputing device predicts (e.g., using content predictor 430) a futurelocation where the user is likely to view content within thecorresponding environment and, based on the predicted location,determines to stream content recorded by one or more of the plurality ofrecording devices. In various embodiments, the computing device streamsthe recorded content from a storage (e.g., storage 120) accessible tothe plurality of recording devices for storing manifests andcorresponding segments (e.g. segments 124) of recorded content of thephysical environment. In some embodiments, the manifests are mediapresentation descriptions (MPDs) or .m3u8 files.

Turning now to FIG. 5C, a flow diagram of a method 560 is depicted.Method 560 is one embodiment of a method that may be performed by acomputing system facilitating the streaming of encoded content, such asstorage 120. In many instances, performance of method 560 may allow auser accessing presented content to have a better user experience.

In step 565, a computing system receives, from a first computing device(e.g., presenting device 130), a request (e.g., streaming request 432)to stream content (e.g., encoded content 118) recorded by a plurality ofcomputing devices (e.g., cameras 110) of a physical environment. Invarious embodiments, the first computing device is configured to presenta corresponding environment based on the streamed content. In someembodiments, the first and second computing devices are head mounteddisplays. In some embodiments, the corresponding environment is anextended reality (XR) environment.

In step 570, the computing system provides, in response to the request,a manifest (e.g., a manifest 122) usable to stream content recorded by asecond of the plurality of computing devices, the manifest includinglocation information identifying a location (e.g., location 114) of thesecond computing device within the physical environment (e.g.,corresponding to space 100).

In step 575, the computing system receives a request (e.g., segmentrequest 434) to provide segments (e.g., segments 124) of the recordedcontent selected based on the identified location and a location (e.g.,location 202) where a user of the first computing device views contentwithin the corresponding environment. In some embodiments, the manifestincludes pose information determined using visual inertial odometry(e.g., as employed by pose sensors 320) by the second computing deviceand identifying a pose (e.g., pose 116) of the second computing devicewhile recording the content, and the pose information is usable by thefirst computing device to select the segments based on the pose of thesecond computing device and a pose (e.g., pose 204) of the firstcomputing device while presenting the corresponding environment. In someembodiments, the manifest includes a reference time (e.g., referencetime 332) for when the content is recorded by the second computingdevice, and the reference time is usable by the first computing devicewith reference times associated with the content recorded by one or moreothers of the plurality of computing devices to patch together a view(e.g., XR view 435) of the corresponding environment from the contentrecorded by the second computing device and the content recorded by theone or more other computing devices.

In step 580, the computing system provides the selected segments to thefirst computing device.

Turning now to FIG. 6, a block diagram of components within presentingdevice 130 and a camera 110 is depicted. In some embodiments, presentingdevice 130 is a head-mounted display (HMD) configured to be worn on thehead and to display content, such as an XR view 436, to a user. Forexample, device 130 may be a headset, helmet, goggles, glasses, a phoneinserted into an enclosure, etc. worn by a user. As noted above,however, presenting device 130 may correspond to other devices in otherembodiments, which may include one or more of components 604-650. In theillustrated embodiment, device 130 includes world sensors 604, usersensors 606, a display system 610, controller 620, memory 630, secureelement 640, and a network interface 650. As shown, camera 110 (orstorage 120 in some embodiments) includes a controller 660, memory 670,and network interface 680. In some embodiments, device 130 and cameras110 may be implemented differently than shown. For example, device 130and/or camera 110 may include multiple network interfaces 650, device130 may not include a secure element 640, cameras 110 may include asecure element 640, etc.

World sensors 604, in various embodiments, are sensors configured tocollect various information about the environment in which a user wearsdevice 130 and may be used to create recorded content 118. In someembodiments, world sensors 604 may include one or more visible-lightcameras that capture video information of the user's environment. Thisinformation also may, for example, be used to provide an XR view 436 ofthe real environment, detect objects and surfaces in the environment,provide depth information for objects and surfaces in the realenvironment, provide position (e.g., location and orientation) andmotion (e.g., direction and velocity) information for the user in thereal environment, etc. In some embodiments, device 130 may include leftand right cameras located on a front surface of the device 130 atpositions that are substantially in front of each of the user's eyes. Inother embodiments, more or fewer cameras may be used in device 130 andmay be positioned at other locations. In some embodiments, world sensors604 may include one or more world mapping sensors (e.g., infrared (IR)sensors with an IR illumination source, or Light Detection and Ranging(LIDAR) emitters and receivers/detectors) that, for example, capturedepth or range information for objects and surfaces in the user'senvironment. This range information may, for example, be used inconjunction with frames captured by cameras to detect and recognizeobjects and surfaces in the real-world environment, and to determinelocations, distances, and velocities of the objects and surfaces withrespect to the user's current position and motion. The range informationmay also be used in positioning virtual representations of real-worldobjects to be composited into an XR environment at correct depths. Insome embodiments, the range information may be used in detecting thepossibility of collisions with real-world objects and surfaces toredirect a user's walking. In some embodiments, world sensors 604 mayinclude one or more light sensors (e.g., on the front and top of device130) that capture lighting information (e.g., direction, color, andintensity) in the user's physical environment. This information, forexample, may be used to alter the brightness and/or the color of thedisplay system in device 130.

User sensors 606, in various embodiments, are sensors configured tocollect various information about a user wearing device 130 and may beused to produce encoded content 118. In some embodiments, user sensors606 may include one or more head pose sensors (e.g., IR or RGB cameras)that may capture information about the position and/or motion of theuser and/or the user's head. The information collected by head posesensors may, for example, be used in determining how to render anddisplay views 436 of the XR environment and content within the views.For example, different views 436 of the environment may be renderedbased at least in part on the position of the user's head, whether theuser is currently walking through the environment, and so on. As anotherexample, the augmented position and/or motion information may be used tocomposite virtual content into the scene in a fixed position relative tothe background view of the environment. In some embodiments there may betwo head pose sensors located on a front or top surface of the device130; however, in other embodiments, more (or fewer) head-pose sensorsmay be used and may be positioned at other locations. In someembodiments, user sensors 606 may include one or more eye trackingsensors (e.g., IR cameras with an IR illumination source) that may beused to track position and movement of the user's eyes. In someembodiments, the information collected by the eye tracking sensors maybe used to adjust the rendering of images to be displayed, and/or toadjust the display of the images by the display system of the device130, based on the direction and angle at which the user's eyes arelooking. In some embodiments, the information collected by the eyetracking sensors may be used to match direction of the eyes of an avatarof the user to the direction of the user's eyes. In some embodiments,brightness of the displayed images may be modulated based on the user'spupil dilation as determined by the eye tracking sensors. In someembodiments, user sensors 606 may include one or more eyebrow sensors(e.g., IR cameras with IR illumination) that track expressions of theuser's eyebrows/forehead. In some embodiments, user sensors 606 mayinclude one or more lower jaw tracking sensors (e.g., IR cameras with IRillumination) that track expressions of the user's mouth/jaw. Forexample, in some embodiments, expressions of the brow, mouth, jaw, andeyes captured by sensors 606 may be used to simulate expressions on anavatar of the user in a co-presence experience and/or to selectivelyrender and composite virtual content for viewing by the user based atleast in part on the user's reactions to the content displayed by device130. In some embodiments, user sensors 606 may include one or more handsensors (e.g., IR cameras with IR illumination) that track position,movement, and gestures of the user's hands, fingers, and/or arms. Forexample, in some embodiments, detected position, movement, and gesturesof the user's hands, fingers, and/or arms may be used to simulatemovement of the hands, fingers, and/or arms of an avatar of the user ina co-presence experience. As another example, the user's detected handand finger gestures may be used to determine interactions of the userwith virtual content in a virtual space, including but not limited togestures that manipulate virtual objects, gestures that interact withvirtual user interface elements displayed in the virtual space, etc.

In some embodiments, world sensors 404 and/or user sensors 606 may beused implement one or more of elements 310-350 and/or 410-420.

Display system 610, in various embodiments, is configured to displayrendered frames to a user. Display 610 may implement any of varioustypes of display technologies. For example, as discussed above, displaysystem 610 may include near-eye displays that present left and rightimages to create the effect of three-dimensional view 602. In someembodiments, near-eye displays may use digital light processing (DLP),liquid crystal display (LCD), liquid crystal on silicon (LCoS), orlight-emitting diode (LED). As another example, display system 610 mayinclude a direct retinal projector that scans frames including left andright images, pixel by pixel, directly to the user's eyes via areflective surface (e.g., reflective eyeglass lenses). To create athree-dimensional effect in view 602, objects at different depths ordistances in the two images are shifted left or right as a function ofthe triangulation of distance, with nearer objects shifted more thanmore distant objects. Display system 610 may support any medium such asan optical waveguide, a hologram medium, an optical combiner, an opticalreflector, or any combination thereof. In some embodiments, displaysystem 610 may be the transparent or translucent and be configured tobecome opaque selectively. In some embodiments, display system 610 mayimplement display 440 discussed above.

Controller 620, in various embodiments, includes circuitry configured tofacilitate operation of device 130. Accordingly, controller 620 mayinclude one or more processors configured to execute programinstructions, such as streaming application 132, to cause device 130 toperform various operations described herein. These processors may beCPUs configured to implement any suitable instruction set architecture,and may be configured to execute instructions defined in thatinstruction set architecture. For example, in various embodimentscontroller 620 may include general-purpose or embedded processorsimplementing any of a variety of instruction set architectures (ISAs),such as ARM, x86, PowerPC, SPARC, RISC, or MIPS ISAs, or any othersuitable ISA. In multiprocessor systems, each of the processors maycommonly, but not necessarily, implement the same ISA. Controller 620may employ any microarchitecture, including scalar, superscalar,pipelined, superpipelined, out of order, in order, speculative,non-speculative, etc., or combinations thereof. Controller 620 mayinclude circuitry to implement microcoding techniques. Controller 620may include one or more levels of caches, which may employ any size andany configuration (set associative, direct mapped, etc.). In someembodiments, controller 620 may include at least GPU, which may includeany suitable graphics processing circuitry. Generally, a GPU may beconfigured to render objects to be displayed into a frame buffer (e.g.,one that includes pixel data for an entire frame). A GPU may include oneor more graphics processors that may execute graphics software toperform a part or all of the graphics operation, or hardwareacceleration of certain graphics operations. In some embodiments,controller 620 may include one or more other components for processingand rendering video and/or images, for example image signal processors(ISPs), coder/decoders (codecs), etc. In some embodiments, controller620 may be implemented as a system on a chip (SOC).

Memory 630, in various embodiments, is a non-transitory computerreadable medium configured to store data and program instructionsexecuted by processors in controller 620 such as streaming application132. Memory 630 may include any type of volatile memory, such as dynamicrandom-access memory (DRAM), synchronous DRAM (SDRAM), double data rate(DDR, DDR2, DDR3, etc.) SDRAM (including mobile versions of the SDRAMssuch as mDDR3, etc., or low power versions of the SDRAMs such as LPDDR2,etc.), RAMBUS DRAM (RDRAM), static RAM (SRAM), etc. Memory 630 may alsobe any type of non-volatile memory such as NAND flash memory, NOR flashmemory, nano RAM (NRAM), magneto-resistive RAM (MRAM), phase change RAM(PRAM), Racetrack memory, Memristor memory, etc. In some embodiments,one or more memory devices may be coupled onto a circuit board to formmemory modules such as single inline memory modules (SIMMs), dual inlinememory modules (DIMMs), etc. Alternatively, the devices may be mountedwith an integrated circuit implementing system in a chip-on-chipconfiguration, a package-on-package configuration, or a multi-chipmodule configuration.

Secure element (SE) 640, in various embodiments, is a secure circuitconfigured perform various secure operations for device 130. As usedherein, the term “secure circuit” refers to a circuit that protects anisolated, internal resource from being directly accessed by an externalcircuit such as controller 620. This internal resource may be memorythat stores sensitive data such as personal information (e.g., biometricinformation, credit card information, etc.), encryptions keys, randomnumber generator seeds, etc. This internal resource may also becircuitry that performs services/operations associated with sensitivedata such as encryption, decryption, generation of digital signatures,etc. For example, SE 640 may maintain one or more cryptographic keysthat are used to encrypt data stored in memory 630 in order to improvethe security of device 130. As another example, secure element 640 mayalso maintain one or more cryptographic keys to establish secureconnections between cameras 110, storage 120, etc., authenticate device130 or a user of device 130, etc. As yet another example, SE 640 maymaintain biometric data of a user and be configured to perform abiometric authentication by comparing the maintained biometric data withbiometric data collected by one or more of user sensors 606. As usedherein, “biometric data” refers to data that uniquely identifies theuser among other humans (at least to a high degree of accuracy) based onthe user's physical or behavioral characteristics such as fingerprintdata, voice-recognition data, facial data, iris-scanning data, etc.

Network interface 650, in various embodiments, includes one or moreinterfaces configured to communicate with external entities such asstorage 120 and/or cameras 110. Network interface 650 may support anysuitable wireless technology such as Wi-Fi®, Bluetooth®, Long-TermEvolution™, etc. or any suitable wired technology such as Ethernet,Fibre Channel, Universal Serial Bus™ (USB) etc. In some embodiments,interface 650 may implement a proprietary wireless communicationstechnology (e.g., 60 gigahertz (GHz) wireless technology) that providesa highly directional wireless connection. In some embodiments, device130 may select between different available network interfaces based onconnectivity of the interfaces as well as the particular user experiencebeing delivered by device 130. For example, if a particular userexperience requires a high amount of bandwidth, device 130 may select aradio supporting the proprietary wireless technology when communicatingwirelessly to stream higher quality content. If, however, a user ismerely a lower-quality movie, Wi-Fi® may be sufficient and selected bydevice 130. In some embodiments, device 130 may use compression tocommunicate in instances, for example, in which bandwidth is limited.

Controller 660, in various embodiments, includes circuitry configured tofacilitate operation of device 130. Controller 660 may implement any ofthe functionality described above with respect to controller 620. Forexample, controller 660 may include one or more processors configured toexecute program instructions to cause camera 110 to perform variousoperations described herein such as executing encoder 112 to encoderecorded content 118.

Memory 670, in various embodiments, is configured to store data andprogram instructions executed by processors in controller 660. Memory670 may include any suitable volatile memory and/or non-volatile memorysuch as those noted above with memory 630. Memory 670 may be implementedin any suitable configuration such as those noted above with memory 630.

Network interface 680, in various embodiments, includes one or moreinterfaces configured to communicate with external entities such asdevice 130 as well as storage 120. Network interface 680 may alsoimplement any of suitable technology such as those noted above withrespect to network interface 650.

Although specific embodiments have been described above, theseembodiments are not intended to limit the scope of the presentdisclosure, even where only a single embodiment is described withrespect to a particular feature. Examples of features provided in thedisclosure are intended to be illustrative rather than restrictiveunless stated otherwise. The above description is intended to cover suchalternatives, modifications, and equivalents as would be apparent to aperson skilled in the art having the benefit of this disclosure.

The scope of the present disclosure includes any feature or combinationof features disclosed herein (either explicitly or implicitly), or anygeneralization thereof, whether or not it mitigates any or all of theproblems addressed herein. Accordingly, new claims may be formulatedduring prosecution of this application (or an application claimingpriority thereto) to any such combination of features. In particular,with reference to the appended claims, features from dependent claimsmay be combined with those of the independent claims and features fromrespective independent claims may be combined in any appropriate mannerand not merely in the specific combinations enumerated in the appendedclaims.

What is claimed is:
 1. A non-transitory computer readable medium havingprogram instructions stored therein that are executable by a firstcomputing device to cause the first computing device to performoperations comprising: recording content of a physical environment inwhich the first computing device is located, wherein the content isdeliverable to a second computing device configured to present acorresponding environment based on the recorded content and contentrecorded by one or more additional computing devices; determining alocation of the first computing device within the physical environment;and encoding the location in a manifest usable to stream the contentrecorded by the first computing device to the second computing device,wherein the encoded location is usable by the second computing device todetermine whether to stream the content recorded by the first computingdevice.
 2. The computer readable medium of claim 1, wherein the locationis encoded in a manner that allows the second computing device todetermine a location where the content is recorded by the firstcomputing device relative to a location where a user of the secondcomputing device views content within the corresponding environment. 3.The computer readable medium of claim 1, wherein the operations furthercomprise: determining a pose of the first computing device whilerecording the content; and encoding the pose in the manifest, whereinthe encoded pose is usable by the second computing device to determinewhether to stream the content recorded by the first computing devicebased on a pose of the second computing device while presenting thecorresponding environment.
 4. The computer readable medium of claim 1,wherein the operations further comprise: determining a reference timefor when the content is recorded by the first computing device; andencoding the reference time in the manifest, wherein the reference timeis usable by the second computing device with reference times associatedwith the content recorded by the one or more additional computingdevices to patch together the content recorded by the first computingdevice and the content recorded by the one or more additional computingdevices to present the corresponding environment.
 5. The computerreadable medium of claim 1, wherein the operations further comprise:providing, to a storage accessible to the second computing device forstreaming the recorded content, segments of the recorded content and themanifest.
 6. The computer readable medium of claim 1, wherein themanifest is a media presentation description (MPD) usable to stream therecorded content to the second computing device via Moving PictureExperts Group Dynamic Adaptive Streaming over HTTP (MPEG-DASH).
 7. Thecomputer readable medium of claim 1, wherein the manifest is one or more.m3u8 files usable to stream the recorded content to the secondcomputing device via HTTP Live Streaming (HLS).
 8. The computer readablemedium of claim 1, wherein the first computing device is a head mounteddisplay (HMD) configured to record the content using one or more forwardfacing cameras included in the HMD, and wherein the correspondingenvironment is an extended reality (XR) environment.
 9. A non-transitorycomputer readable medium having program instructions stored therein thatare executable by a computing device to cause the computing device toperform operations comprising: presenting a corresponding environmentbased on content recorded of a physical environment by a plurality ofrecording devices within the physical environment, wherein presentingthe corresponding environment includes: downloading a manifestidentifying a location of a first of the plurality of recording deviceswhile recording content of the physical environment; and determining tostream the content recorded by the first recording device based on theidentified location and a location where a user views content within thecorresponding environment.
 10. The computer readable medium of claim 9,wherein presenting the corresponding environment includes: receiving aninput from the user altering the location where the user views contentwithin the corresponding environment; in response to the alteredlocation: determining to discontinue streaming the content recorded bythe first recording device; and determining to stream the contentrecorded by a second of the plurality of recording devices based on anidentified location of the second recording device.
 11. The computerreadable medium of claim 10, wherein presenting the correspondingenvironment includes: predicting a future location where the user islikely to view content within the corresponding environment; and basedon the predicted location, determining to stream content recorded by oneor more of the plurality of recording devices.
 12. The computer readablemedium of claim 9, wherein presenting the corresponding environmentincludes: reading pose information included in the downloaded manifest,wherein the pose information identifies a pose of the first recordingdevice while recording content of the physical environment; anddetermining to stream the content recorded by the first recording devicebased on the identified pose and a pose of the computing device while auser views content within the corresponding environment.
 13. Thecomputer readable medium of claim 9, wherein the computing device is ahead mounted display (HMD), wherein the pose of the computing devicecorresponds to an orientation of the user's head, and wherein thecorresponding environment is an extended reality (XR) environment. 14.The computer readable medium of claim 9, wherein presenting thecorresponding environment includes: reading a reference time included inthe downloaded manifest, wherein the reference time identifies when thecontent is recorded by the first recording device; and creating a viewof the corresponding environment by patching together the contentrecorded by the first recording device and content recorded by one ormore others of the plurality of recording devices based on the referencetime and reference times associated with the content recorded by the oneor more other recording devices.
 15. The computer readable medium ofclaim 9, wherein presenting the corresponding environment includes:streaming the recorded content from a storage accessible to theplurality of recording devices for storing manifests and correspondingsegments of recorded content of the physical environment.
 16. Thecomputer readable medium of claim 15, wherein the manifests are mediapresentation descriptions (MPDs) or .m3u8 files.
 17. A method,comprising: receiving, by a computing system from a first computingdevice, a request to stream content recorded by a plurality of computingdevices of a physical environment, wherein the first computing device isconfigured to present a corresponding environment based on the streamedcontent; in response to the request, providing, by the computing system,a manifest usable to stream content recorded by a second of theplurality of computing devices, wherein the manifest includes locationinformation identifying a location of the second computing device withinthe physical environment; receiving, by the computing system, a requestto provide segments of the recorded content selected based on theidentified location and a location where a user of the first computingdevice views content within the corresponding environment; andproviding, by the computing system, the selected segments to the firstcomputing device.
 18. The method of claim 17, wherein the manifestincludes pose information determined using visual inertial odometry bythe second computing device and identifying a pose of the secondcomputing device while recording the content; and wherein the poseinformation is usable by the first computing device to select thesegments based on the pose of the second computing device and a pose ofthe first computing device while presenting the correspondingenvironment.
 19. The method of claim 17, wherein the manifest includes areference time for when the content is recorded by the second computingdevice; and wherein the reference time is usable by the first computingdevice with reference times associated with the content recorded by oneor more others of the plurality of computing devices to patch together aview of the corresponding environment from the content recorded by thesecond computing device and the content recorded by the one or moreother computing devices.
 20. The method of claim 17, wherein the firstand second computing devices are head mounted displays, and wherein thecorresponding environment is an extended reality (XR) environment.